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	parse.h - 9base - revived minimalist port of Plan 9 userland to Unix
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	parse.h (1909B)
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	1 typedef struct Addr Addr;
	2 typedef struct Cmd Cmd;
	3 struct Addr
	4 {
	5 char type; /* # (char addr), l (line addr), / ? . …
	6 union{
	7 String *re;
	8 Addr aleft; / left side of , and…
	9 } g;
	10 Posn num;
	11 Addr next; / or right side of , …
	12 };
	13
	14 #define are g.re
	15 #define left g.aleft
	16
	17 struct Cmd
	18 {
	19 Addr addr; / address (range of t…
	20 String re; / regular expression …
	21 union{
	22 Cmd cmd; / target of x, g, {, et…
	23 String text; / text of a, c, i; …
	24 Addr addr; / address for m, t */
	25 } g;
	26 Cmd next; / pointer to next elem…
	27 short num;
	28 ushort flag; /* whatever */
	29 ushort cmdc; /* command character;…
	30 };
	31
	32 #define ccmd g.cmd
	33 #define ctext g.text
	34 #define caddr g.addr
	35
	36 extern struct cmdtab{
	37 ushort cmdc; /* command character */
	38 uchar text; /* takes a textual argument? */
	39 uchar regexp; /* takes a regular expressio…
	40 uchar addr; /* takes an address (m or t)? …
	41 uchar defcmd; /* default command; 0==>none…
	42 uchar defaddr; /* default address */
	43 uchar count; /* takes a count e.g. s2/// */
	44 char token; / takes text terminated by o…
	45 int (fn)(File, Cmd); / function to call with p…
	46 }cmdtab[];
	47
	48 enum Defaddr{ /* default addresses */
	49 aNo,
	50 aDot,
	51 aAll
	52 };
	53
	54 int nl_cmd(File, Cmd), a_cmd(File, Cmd), b_cmd(File, Cmd);
	55 int c_cmd(File, Cmd), cd_cmd(File, Cmd), d_cmd(File, Cmd);
	56 int D_cmd(File, Cmd), e_cmd(File, Cmd);
	57 int f_cmd(File, Cmd), g_cmd(File, Cmd), i_cmd(File, Cmd);
	58 int k_cmd(File, Cmd), m_cmd(File, Cmd), n_cmd(File, Cmd);
	59 int p_cmd(File, Cmd), q_cmd(File, Cmd);
	60 int s_cmd(File, Cmd), u_cmd(File, Cmd), w_cmd(File, Cmd);
	61 int x_cmd(File, Cmd), X_cmd(File, Cmd), plan9_cmd(File, Cmd…
	62 int eq_cmd(File, Cmd);
	63
	64
	65 String *getregexp(int);
	66 Addr *newaddr(void);
	67 Address address(Addr*, Address, int);
	68 int cmdexec(File, Cmd);